ddl: make added count correct in adding index (#6980)
ddl: make added count correct in adding index (#6980)


ngaut/tidb,coocood/tidb,pingcap/tidb,ming-relax/tidb,coocood/tidb,kyle-wang/tidb,ngaut/tidb,mccxj/tidb,wusphinx/tidb,CodeRushing/tidb,pingcap/tidb,qiuyesuifeng/tidb,mccxj/tidb,c4pt0r/tidb,c4pt0r/tidb,cosmtrek/tidb,XuHuaiyu/tidb,pingcap/tidb,EvilMcJerkface/tidb,Nify/tidb,pingcap/tidb,kyle-wang/tidb,wusphinx/tidb,EvilMcJerkface/tidb,kyle-wang/tidb,ming-relax/tidb,c4pt0r/tidb,kyle-wang/tidb,tiancaiamao/tidb,kyle-wang/tidb,ngaut/tidb,c4pt0r/tidb,Nify/tidb,pingcap/tidb,CodeRushing/tidb,c4pt0r/tidb,pingcap/tidb,kyle-wang/tidb,ngaut/tidb,qiuyesuifeng/tidb,tiancaiamao/tidb,ngaut/tidb,ngaut/tidb,Cofyc/tidb,cosmtrek/tidb,Cofyc/tidb,XuHuaiyu/tidb,c4pt0r/tidb